Li Anhu, Sun Wansong, Liu Xingsheng, Gong Wei
Appl Opt. 2018 May 10;57(14):3873-3880. doi: 10.1364/AO.57.003873.
Rotation Risley prisms are increasingly used for laser tracking due to high precision and good dynamic performance. In this paper, a novel laser coarse-fine coupling tracking method based on two pairs of rotation Risley prisms is proposed to perform the forward and inverse tracking function. The second pair of rotation Risley prisms with narrower wedge angle can achieve higher precision tracking with narrower field of view than the first one, enriching the coarse-fine coupling tracking trajectory patterns. Moreover, an inverse algorithm based on the two-step method and Newton's iterative method is applied to solve the inverse issue for laser coarse-fine coupling tracking. Two cases further demonstrate that the motion switching strategy executed with the inverse solutions can steer the beam to track the desired motion trajectory. An experiment validates the availability of the cascaded rotation Risley-prism pairs to perform the laser coarse-fine coupling tracking function.
旋转里斯利棱镜因其高精度和良好的动态性能而越来越多地用于激光跟踪。本文提出了一种基于两对旋转里斯利棱镜的新型激光粗精耦合跟踪方法，以实现正向和反向跟踪功能。与第一对相比，具有较窄楔角的第二对旋转里斯利棱镜可以在较窄的视场内实现更高精度的跟踪，丰富了粗精耦合跟踪轨迹模式。此外，应用基于两步法和牛顿迭代法的逆算法来解决激光粗精耦合跟踪的逆问题。两个案例进一步证明，利用逆解执行的运动切换策略可以引导光束跟踪所需的运动轨迹。实验验证了级联旋转里斯利棱镜对执行激光粗精耦合跟踪功能的有效性。
